* ********Please CHECK WRONG ANSWERS before responding********* * ****ANSWER is NOT 4.678 seconds/0.0779 minutes**** *

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********Please CHECK WRONG ANSWERS beforeresponding*********
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****ANSWER is NOT 4.678 seconds/0.0779minutes****
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Please Check Wrong Answers Before Responding Answer Is Not 4 678 Seconds 0 0779 Minutes 1 (57.28 KiB) Viewed 68 times

2) Suppose you have a sample with 100 mCi of 82 Sr. When will the activity of 82Rb reach over 99% of the activity of 82 Sr? 7.74e-11 min Submit Hide Help Help: Since the daughter's half-life is much smaller than the parent's half-life, the daugther reaches the parent's activity only asymptotically over several half-lives. Activity of daughter after n half-lives: ARb = Asr(1 - (1/2)"). You need to find the value of n such that Arb/Asr >= 0.99. Note: You do not have to find the exact time when Arb/Asr = 0.99. Instead find the smallest value of the integer n such that, after n half-lives Arb/Asr >= 0.99. Your submissions: 7.74e-11 X Computed value: 7. 7.7e-11 X Feedback: 4.68 IX 2.4e5 IX X Xestion 1) will there be after 20 minutes? IX x mCi Submit 0.07798 3) How much daught 7.8e-2 8.3 20 0